import java.io.*;
import java.util.StringTokenizer;

public class Myself_io {
    private static PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
    private static Read in = new Read();
    public static void main(String[] args) throws IOException{
        in.next();
        out.println('a');
        out.close();
    }

}

class Read{
    StringTokenizer st = new StringTokenizer("");
    BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));

    String next() throws IOException {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(bf.readLine());
        }
        return st.nextToken();
    }

    int nextInt() throws IOException{
        return Integer.parseInt(next());
    }

    String nextLine() throws IOException{
        return bf.readLine();
    }

    Double nextDouble() throws IOException{
        return Double.parseDouble(next());
    }

    Long nextLong() throws IOException{
        return Long.parseLong(next());
    }
}
